King 4, Bed 15, La Difunta Section, Las Delicias (Permian of Mexico)

Where: Coahuila, Mexico (26.4° N, 102.9° W: paleocoordinates 2.0° S, 34.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Palo Quemado Formation, Wordian (266.9 - 264.3 Ma)

Environment/lithology: marine; lithified, blue limestone

• The Permian rocks are folded in a syncline, and western limb is referred to as the Difunta flank. The strata in the Difunta flank dip to the east at an average angle of 45 degrees.
• Hard blue sponge limestone (from section description, p. 13). Prominent limestone layers separated from one another by shale, graywacke, and lava. Beds 11 to 17 and lower part of bed 10. Most imporant member is bed 15, which caps Cerro Caballo. Massive limestones have adundant sponges, crinoidal fragments; shales and thin limestones contain cephalopods. (From a general stratigraphy table, Fig. 3, p. 19).

Size class: macrofossils

Primary reference: R. E. King. 1944. Geology, Part I of Geology and paleontology of the Permian area northwest of Las Delicias, southwestern Coahulia, Mexico. Geological Society of America Special Paper 52:3-33 [T. Olszewski/L. Fall/L. Fall]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 62902: authorized by Tom Olszewski, entered by Leigh Fall on 01.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Nautilida - Liroceratidae
? Liroceras sp.
? Liroceras sp. Teichert 1940 nautiloid